<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>基础的get请求</title>
</head>

<body>
    <h1>POST请求</h1>
    <form id="form">
        <input type="text" name="name">
        <input type="text" name="age">
        <input type="text" name="sex">
        <button id="btn">提交</button>
    </form>
    <script>
        const oForm = document.getElementById('form')
        const oName = document.querySelector('#form input[name=name]');
        const oAge = document.querySelector('#form input[name=age]');
        const oSex = document.querySelector('#form input[name=sex]');
        const oBtn = document.getElementById('btn')

        oForm.onsubmit = function () {
            //收集表单数据
            const nameValue = oName.value;
            const ageValue = oAge.value;
            const sexValue = oSex.value;

            const xhr = new XMLHttpRequest();

            xhr.open("POST", "/adduser?", true);

            //请求体的数据放在send中传递
            //因为请求体类型有很多,所以发送请求的时候一定要设置请求头的Content-Type类型
            xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
            xhr.send(`name=${nameValue}&age=${ageValue}&sex=${sexValue}`);

            //   xhr.setRequestHeader("Content-Type", "application/json;charset=utf-8")
            //   xhr.send(JSON.stringify({
            //     name: nameValue,
            //     age: ageValue,
            //     sex:sexValue
            //   }));

            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4 && (xhr.status >= 200 && xhr.status <= 299)) {
                    console.log(xhr.responseText);
                }
            }

            return false
        }
    </script>
</body>

</html>